Once a Harmoniser becomes a Martial Master, they could tap into their race's exclusive energy, the Kalki Qi. And, when the Pranic Avatar was summoned after consuming 100 units Elemental Qi and 100 units of Kalki Qi, the summoned Pranic Avatar could exist in the material world permanently.
It wouldn't dissipate after time had passed. Moreover, its lifespan was double its respective Harmoniser.
Only the members of the Royal Clan possessed the Pranic Avatar with five foundations. This wasn't a stage that could be attained through any means other than by being born as part of the Royal Clan. The limit to develop the foundation of a Pranic Avatar was only four, end even that was so rare, it was almost a myth, for it relied on a mystical item.